1. The vibration of an object causes variations in ?? which are transmitted through the air in sound waves. Air molecules
2. As the sound wave travels through the air the air molecules experience (being pushed together),and (pulling apart). Pushed together is called:?? compression Molecules pulled apart is called:?? refraction
3. The frequency range of human hearing is from ? Hz to ? kHz 20 Hz to 20 kHz
4. The perceived intensity or volume of a sound is measured in units called ?? amplitude
5. The intensity level known as the “threshold of pain” is ?? 120 dB
6. List four waveforms commonly used as building blocks for synthesis: a. sine - only has fundamental pitch b. square - has every other harmonic (all the odds) c. sawtooth - has all harmonics d. triangle - tapers off quickly has to do with how many harmonics are present complex waves - natural sounds, like voices
7. The frequency of a pitch one octave higher than 450 Hz is _Hz. 900 Hz
8. To double the loudness of a sound, the power must increase ?? times. 10 times
9. The amount of energy expended in making a sound is called the power of the sound and is measured in ?? Watts
10. The predominant perceived pitch of a timbre is called the ?? fundamental.
11. The series of frequencies present in a timbre is called the ?? series. Harmonic/overtone series
12. “Cycles per second” or “cps” measures what aspect of sound?
13. Amplitude is a measurement of a sound's ?? Loudness
14. Timbre or tone color is created by the many different ?? present in a sound. Harmonics
15. Describe the Doppler Effect. (Car going by)
Comb filtering: waves out of phase with each other creates little peaks and valleys; use absorption and diffusion to get rid of it. Diffusion on back wall, absorption in corners for bass traps
standing waves: the waves that will cancel or boost measure by finding l, w, and h of the room; use half speed of sound - find each frequency and find all the harmonics, compare. Modes with similar frequency zones would be likely to cancel or boost.
In order for a sound to be perceived as twice as loud, it has to be actually 10 times louder.
Air molecules
2. As the sound wave travels through the air the air molecules experience (being pushed together),and (pulling apart).
Pushed together is called:?? compression
Molecules pulled apart is called:?? refraction
3. The frequency range of human hearing is from ? Hz to ? kHz
20 Hz to 20 kHz
4. The perceived intensity or volume of a sound is measured in units called ??
amplitude
5. The intensity level known as the “threshold of pain” is ??
120 dB
6. List four waveforms commonly used as building blocks for synthesis:
a. sine - only has fundamental pitch
b. square - has every other harmonic (all the odds)
c. sawtooth - has all harmonics
d. triangle - tapers off quickly
has to do with how many harmonics are present
complex waves - natural sounds, like voices
7. The frequency of a pitch one octave higher than 450 Hz is _Hz.
900 Hz
8. To double the loudness of a sound, the power must increase ?? times.
10 times
9. The amount of energy expended in making a sound is called the power of the sound and is measured in ??
Watts
10. The predominant perceived pitch of a timbre is called the ??
fundamental.
11. The series of frequencies present in a timbre is called the ?? series.
Harmonic/overtone series
12. “Cycles per second” or “cps” measures what aspect of sound?
13. Amplitude is a measurement of a sound's ??
Loudness
14. Timbre or tone color is created by the many different ?? present in a sound.
Harmonics
15. Describe the Doppler Effect.
(Car going by)
Comb filtering: waves out of phase with each other creates little peaks and valleys; use absorption and diffusion to get rid of it. Diffusion on back wall, absorption in corners for bass traps
standing waves: the waves that will cancel or boost
measure by finding l, w, and h of the room; use half speed of sound - find each frequency and find all the harmonics, compare. Modes with similar frequency zones would be likely to cancel or boost.
In order for a sound to be perceived as twice as loud, it has to be actually 10 times louder.
double distance from sound, drops 6 dB.
clap echo - between 2 parallel surfaces